#include <iostream>
#include <cstdio>

namespace mytest {
	int num;
}

using namespace std;
using namespace mytest;

int main(void)
{
	int n;

	cin >> n;
	cout << "n的值是" << n << endl;

	cout << "Hello, world!" << endl;
	printf("Good morning!\n");

	num = n;
	cout << "num的值是" << num << endl;

	return 0;
}

